Types and maintenance of British NORGREN solenoid valves

Brand

NORGREN/UK Norgren

Flow Direction

Other

3C Valve Category

Industry

Application Areas

Environmental Protection, Petroleum, Energy, Electronics/Batteries, General

NORGREN solenoid valves are a world-renowned manufacturer and supplier of pneumatic products, providing pneumatic and fluid control solutions to customers worldwide. Through a carefully selected distributor network and an international network of over 16,000 employees in 26 countries, Norgren manufactures and supplies a full range of pneumatic control and automation products, all holding ISO 9001 quality standard certification. This ensures that customers can source the pneumatic products they need from this trusted supplier.

NORGREN's applicable industries include: rail transportation, metallurgy, packaging, medical, automotive, textile, chemical, power, aluminum smelting, inkjet technology, steel, cement, etc.

NORGREN's strength lies in its being part of the diversified and internationally successful IMI Group (£1.57 billion, approximately RMB 23.5 billion), guaranteeing financial strength, stability, and reliability. (IMI is an international power engineering business company that specializes in manufacturing innovative products and providing professional services to major global users in core markets.)

Currently, NORGREN's main products in the Chinese market include: the British NORGREN series, the acquired German NORGREN-HERION series, and the acquired German NORGREN-BUSCHJOST series.

Development in the direction of intelligentization: This mainly refers to how solenoid valves can better cooperate with intelligent instruments to improve the control accuracy and reliability of the system. It is generally believed that on-off regulation is difficult to achieve very high accuracy; however, in many cases, appropriate methods can achieve the required high accuracy while greatly saving costs.

(1) Dual-connected solenoid valves. This is a combination of solenoid valves of different sizes. The metering accuracy of fuel dispensers used extensively is as high as 0.02%, and they all use dual-connected solenoid valves. The large valve opens, allowing refueling to be completed in a short time; then the large valve closes, and the small valve supplements to ensure flow accuracy. This technology has been used abroad for many years, and the products are manufactured by world-renowned solenoid valve companies. Incidentally, it should be pointed out that the metering of large flow rates in domestic oil depots still relies on the import or imitation of foreign multi-stage shut-off valves with complex structures and unstable performance. These products are not manufactured by world-renowned professional companies because market demand is not high enough to attract their interest. In fact, our oil depots would benefit much more from domestically produced large-flow double-valve systems. Double-valve systems are also commonly used to control parameters such as temperature, pressure, and level. The larger valve ensures the basic flow rate, while the smaller valve provides compensation. In systems with relatively stable parameters, this type of on-off control can achieve considerable precision. However, in systems with large parameter variations, the rate of change is still somewhat constrained; for example, temperature control systems are still affected by thermal inertia. Therefore, properly used double-valve systems can significantly reduce costs compared to regulating valves while meeting control requirements.

(2) Three-position solenoid valves and digital valves: The three-position solenoid valve has three working positions. Normally, it is not energized and is in a slightly open state, providing initial flow; given one electrical signal, the solenoid valve fully opens, providing a large flow rate; given another electrical signal, the valve closes. The valve also has a manual device, so that no power is needed when the valve is closed for a long time. The three-position solenoid valve can be regarded as a more compact double solenoid valve. It can easily realize three-position regulation and has been widely used. A further idea is to use n solenoid valves of a certain size in a certain proportion to form 2n kinds of flow, similar to digital circuits, such combined valves are called digital valves. In fact, two double valves or three-position valves of different sizes can produce 24=16 or 32=9 kinds of flow, which can achieve very high precision. In principle, it has the advantage of being matched with industrial control computers, but since the application field has not yet put forward a large demand, this technology is still in the experimental stage. (3) Self-holding solenoid valve: The self-holding solenoid valve only needs to be energized for a moment to complete the valve opening and closing action, and the valve core position does not need to be maintained by electricity. Its advantages are energy saving, especially in the case of using batteries as power supply, and temperature rise can be ignored, so the coil life is long and it has high safety in high and low temperature, explosion-proof and other cases. Common types include mechanical holding and permanent magnet holding, which are further divided into double coil and single coil, with the single coil magnetic holding structure being the simplest. It changes the two states of the corresponding valve's on/off state by altering the polarity of the DC power supply. When installed alone, this type of solenoid valve requires a changeover switch for external coil wiring, but it is very convenient when used with smart instruments. The solenoid valves equipped with IC card prepaid gas meters and water meters are one of the key factors in the success or failure of the instrument. The self-holding technology is an important factor in the success or failure of the solenoid valve. The self-holding solenoid valve in China has become increasingly mature.

NORGREN solenoid valve does not work after being powered on[1] Check if the power supply wiring is faulty → rewire and reconnect the connectors

Different types of solenoid valves (34 pictures) Check if the power supply voltage is within ± working range → adjust to the normal position range

Is the coil unsoldered → resolder

Short circuit in the coil → replace the coil

Is the working pressure difference inappropriate → adjust the pressure difference → or replace with a suitable solenoid valve

The fluid temperature is too high → replace with a suitable solenoid valve

Impurities cause the main valve core and moving iron core of the solenoid valve to jam → clean it. If the seal is damaged, replace the seal and install a filter

The liquid viscosity is too high, the frequency is too high, and the lifespan has expired → replace the product

2. Solenoid valve cannot close

The seal of the main valve core or moving iron core is damaged → replace the seal

Is the fluid temperature or viscosity too high → replace with a suitable solenoid valve Impurities entering the solenoid valve core or moving iron core → Cleaning is required.

Spring lifespan expired or deformed → Replacement is required.

Clogged throttling orifice/balance hole → Cleaning is required promptly.

Excessive operating frequency or expired lifespan → Select or replace the product.

3. Other situations:

Internal leakage → Check for damaged seals and improper spring assembly.

External leakage → Loose connections or damaged seals → Tighten screws or replace seals.

Noise during power-on → Loose fasteners on the head; tighten them.

Voltage fluctuations outside the allowable range; adjust the voltage. Impurities or unevenness on the iron core contact surface; clean or replace promptly.